94 audi tdi

tobyc · 15-11-11, 05:25 PM

Hi all. I have replaced a K plate audi 80 tdi with a M plate one and this one has the MAF rather than the Vane one the older audi had. Is it possible or worth fitting the Vane one in replacement to the MAF as I understand its more reliable?

The main issue which may not even be related to the MAF is that under load the car hits a wall in 4th and 5th typically. I have replaced the fuel pump as it needed doing with a stuttering problem it had which is fixed now but the power/ boost issue is still there. What could it be?

missfire · 15-11-11, 05:45 PM

turbo, wastegate, vacuum leak, MAF, none of these will help if you keep driving the car into walls.. that's a bad habit...

hope you get it fixed.

David Small · 15-11-11, 10:06 PM

Quote:

Originally Posted by missfire

turbo, wastegate, vacuum leak, MAF, none of these will help if you keep driving the car into walls.. that's a bad habit...

hope you get it fixed.

PMSL - Missfire on form again !

Seriously Toby welcome to Classic Audi, I hope you solve your problem - I can't help with TDi unfortunately

tobyc · 15-11-11, 11:06 PM

that had me laugh out loud

how do i check the waste gate is closed? re it being the turbo it kicks in ok in all gears just getting the problem when its under load up a hill mostly in higher gears.

missfire · 16-11-11, 02:16 AM

oh, you are easily amused Mr Small!

tobyc - mmm! dunno, you could check the rest position of the actuator rod thing against this pic. not terribly scientific but might be a start. (down this page a bit)

http://www.ebay.co.uk/itm/Audi-80-A6...-/220760795154

carbon-oily-gunky stuff can cause power loss in these engines is all i know but i've never owned one so might be a case of the blind leading the blind here sorry. cleaning out the ERG valve or inlet manifold i'd fancy doing without disastrous results but cleaning a wastegate that is integral to a turbo like that, i'd probably leave to someone who does it every day, knowing my luck i'd wreck the thing!

pimpdriver · 16-11-11, 06:25 AM

Plug it into vagcom

Tun · 16-11-11, 08:55 AM

Check your fuel lines under the car where they are cliped. My last TDi had a similar problem under load and it was sucking air in through the corroded sections under the clips! no diesel coming out though

. Replaced fuel lines and all was sorted

tobyc · 16-11-11, 01:26 PM

would that come up on vagcom?

Tun · 16-11-11, 01:32 PM

I'm not sure. Quick check is to look at the fuel line under the bonnet, mine were clear lines (plastic) and you could see small air bubbles in them which several mechanics told me were normal, however when the main fuel line were replaced there were no more bubbles and plenty of power under load.

tobyc · 16-11-11, 01:37 PM

yeah I had these bubbles thanks for the suggestion I will get these checked tomorrow and report back.
on a side note has anyone got a pic of the underside of a t85 2.2 coupe quattro fuse box?

16-11-11, 06:25 AM	#6
pimpdriver Devon Pastie Muncher Classic Audi Club Member Join Date: Jul 2007 Location: Calne Wiltshire Posts: 7,530	Plug it into vagcom __________________ Winter tyres now! Driving the B2 80CL as a daily and LOVING it!!!!

16-11-11, 08:55 AM	#7
Tun Grown up member Classic Audi Club Member Join Date: May 2011 Location: Buxton Posts: 745	Check your fuel lines under the car where they are cliped. My last TDi had a similar problem under load and it was sucking air in through the corroded sections under the clips! no diesel coming out though. Replaced fuel lines and all was sorted

15-11-11, 05:45 PM	#2
missfire making wooden things Classic Audi Club Member Join Date: Dec 2009 Location: cow land Posts: 8,156	turbo, wastegate, vacuum leak, MAF, none of these will help if you keep driving the car into walls.. that's a bad habit... hope you get it fixed.

15-11-11, 11:06 PM	#4
tobyc Newbie! Join Date: Nov 2011 Posts: 4	that had me laugh out loud how do i check the waste gate is closed? re it being the turbo it kicks in ok in all gears just getting the problem when its under load up a hill mostly in higher gears.

16-11-11, 02:16 AM	#5
missfire making wooden things Classic Audi Club Member Join Date: Dec 2009 Location: cow land Posts: 8,156	oh, you are easily amused Mr Small! tobyc - mmm! dunno, you could check the rest position of the actuator rod thing against this pic. not terribly scientific but might be a start. (down this page a bit) http://www.ebay.co.uk/itm/Audi-80-A6...-/220760795154 carbon-oily-gunky stuff can cause power loss in these engines is all i know but i've never owned one so might be a case of the blind leading the blind here sorry. cleaning out the ERG valve or inlet manifold i'd fancy doing without disastrous results but cleaning a wastegate that is integral to a turbo like that, i'd probably leave to someone who does it every day, knowing my luck i'd wreck the thing!

16-11-11, 01:26 PM	#8
tobyc Newbie! Join Date: Nov 2011 Posts: 4	would that come up on vagcom?

16-11-11, 01:32 PM	#9
Tun Grown up member Classic Audi Club Member Join Date: May 2011 Location: Buxton Posts: 745	I'm not sure. Quick check is to look at the fuel line under the bonnet, mine were clear lines (plastic) and you could see small air bubbles in them which several mechanics told me were normal, however when the main fuel line were replaced there were no more bubbles and plenty of power under load.

16-11-11, 01:37 PM	#10
tobyc Newbie! Join Date: Nov 2011 Posts: 4	yeah I had these bubbles thanks for the suggestion I will get these checked tomorrow and report back. on a side note has anyone got a pic of the underside of a t85 2.2 coupe quattro fuse box?